Reasons:
1) Didn't know max. deep of dungeon ---> didn't know that I facing final boss. Though it's Saruman
2) Didn't know that Shadow could see through rogues 'cloaking'
3) Didn't know it's possible to summon out of corner :E~~
4) Had quite small speed? (not sure)
5) Missed teleport key (pushed healing instead)
6) Didn't play for a while and made all above mistakes
7) Most important: was annoyed by @#$% troll in my stream chat. Mood was ruined and I made mistakes. From now on I read only in-game chat while playing TomeNET.